Definition of operating regimes

Lopes et al. [24, 43] presented a conceptual analysis of the different operating regimes that may appear in a wall-coated monolith/microreactor. There are several particularities in the proposed methodology compared with other studies in the 

Feature/model Navier-Stokes Boundary layer Plug flow 

Mechanisms Transport of mass, heat, and momentum Radial transport to/from the Radial gradients negligible 

Classification of governing equations Elliptic PDE Parabolic PDE ODE for average concentration axial variation 

Validity Less restrictive assumptions Adequate to represent cases with low values of Rbl (where the role of axial diffusion gains importance) Increasingly appropriate as Rsi increases, thus for Rei 1 Cases dominated by convection d/L ReaSc4 L/d 

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